We've done it twice in a sedan - a Honda Ballade. There's one bit with a very steep incline which gave us a few laughs in October last year. It was loaded with 4 adults and luggage. 2 Adults had to walk a bit to get the car up there. But unloaded, it made the trip easily every time.

It's a paved road all the way to the top. We made some photographs of the surface, will have to go look for it though.